Franklin County Water District Preliminary Engineering Report (PER) Flood Relief Project Alternatives 3/6/2017 CarolloBlueTemplateWithLogo.pptx D AVID H ARKINS , P.E., P H D. P HIL B ULLOCK , P.E.
Carollo delivers national expertise specializing ONLY in water and wastewater CarolloBlueTemplateWithLogo.pptx 2
Lake Cypress Springs E MERGENCY S PILLWAY L AKE B OB S ANDLIN LCS D AM M ORNING G LORY -T YPE S ERVICE S PILLWAY CarolloBlueTemplateWithLogo.pptx 18” L OW F LOW V ALVE S TRUCTURE 3
Lake Cypress Springs Spillway CarolloBlueTemplateWithLogo.pptx 4
December 2015 Event (383.92’) 350-YR Event Event Elevation 2-year 379.1 5-year 379.5 10-year 379.9 25-year 380.5 50-year 381.3 100-year 382.3 CarolloBlueTemplateWithLogo.pptx 500-year 384.7 5
Data Gathering for Analysis – Elevations CarolloBlueTemplateWithLogo.pptx 6
Data Gathering for Analysis – Elevations CarolloBlueTemplateWithLogo.pptx 7
Data Gathering for Analysis – Elevations Lake Cypress Springs Home Elevation Survey Results 90 80 70 60 50 40 30 20 10 0 CarolloBlueTemplateWithLogo.pptx 380 382 384 386 388 390 392 394 396 398 400 402 404 406 408 410 412 414 416 419 421 425 432 442 Below the Above the Above the Dam Spillway Spillway 8
Data Gathering for Analysis – Elevations Count of Homes below 385.5' 35 29 30 25 25 20 17 17 15 11 10 10 5 4 4 5 3 2 1 CarolloBlueTemplateWithLogo.pptx 0 380 380.5 381 381.5 382 382.5 383 383.5 384 384.5 385 385.5 Homes Below 385.5' 9
Data Gathering for Analysis – Elevations Count of Homes for December 2015 Event (383.92') 1200 988 1000 800 600 17 Homes with Damage were 400 Reported in the Survey 200 CarolloBlueTemplateWithLogo.pptx 37 0 BELOW ABOVE 10
Data Gathering for Analysis – Online Survey Costs Total Structural Damage Cost $571,642.00 Average Total Structural Cost $38,169.14 Total Boathouse Damage Cost $303,144.50 Average Boathouse Damage Cost $7,496.16 Total Retaining Wall Damage Cost $64,561.00 Average Retaining Wall Damage Cost $3,397.95 Total Other Damage Cost $460,977.65 CarolloBlueTemplateWithLogo.pptx Average Other Damage Cost $14,634.57 TOTAL DAMAGE COST ~$1,500,000 11
Data Gathering for Analysis – Online Survey Percentage of Total Damage Cost 26.71% 36.99% 1.60% 4.61% 0.63% 8.09% 13.55% 0.62% 4.61% 2.58% House Guest House Garage Storage Building CarolloBlueTemplateWithLogo.pptx Boat-house Retaining Wall Deck or Dock Water Pump Vehicles Boats 12
Data Gathering for Analysis - Samples CarolloBlueTemplateWithLogo.pptx 13
Evaluated Alternatives 1. Addition of canal on emergency spillway 2. Addition of box culverts on north end of Lake Cypress Springs Dam (LCS) 3. Add tainter gates to LCS dam (comparable to Lake Bob Sandlin (LBS)) 4. Add pump station at north end of LCS Dam 5. Additional morning glory spillway CarolloBlueTemplateWithLogo.pptx 6. Operational Alternative 14
Additional Canal CROSSING SECTION CANAL SECTION CarolloBlueTemplateWithLogo.pptx 1,000 FT 15
Canal Section CONCRETE LINED CANALS NATURAL CANALS OVERBANK CANALS CarolloBlueTemplateWithLogo.pptx 16
Crossing Section CAST-IN PLACE BRIDGES CULVERTS CarolloBlueTemplateWithLogo.pptx LOW PROFILE LOW WATER 17 CULVERTS CROSSINGS
Box Culverts CarolloBlueTemplateWithLogo.pptx 18
Building a Tainter Gate System Tainter gates open at Lake Bob Sandlin Tainter gates at Lake Bob Sandlin CarolloBlueTemplateWithLogo.pptx 19
Response from the Public Alternatives Responses (For/Against) from the Public 30 25 20 Votes (multiple allowed per person) 15 10 FOR: 5 AGAINST: 0 -5 -10 CarolloBlueTemplateWithLogo.pptx -15 1 2 3 4 5 6 Structural Alternative (6 = Operational Alternative) 20
5 Task Hurdles / 3 Sub-Alternatives Task Hurdle Hydraulic Federal / State Local Agency Cost Minimal Feasibility Agency Approval Feasibility Impact to Approval is (Downstream Water Supply Feasible Stakeholders) is Feasible Sub-Alternative Identification Sub-Alternatives Sub-Alternative A Sub-Alternative B Sub-Alternative C 350-Yr Flood Event 100-Yr Flood Event 500-Yr Flood Event (December 2015 Event) CarolloBlueTemplateWithLogo.pptx Max Water Surface Elevation Max Water Surface Elevation Max Water Surface Elevation 381.00 msl 381.00 msl 381.00 msl 21
Alternatives Matrix Task Hurdle Local Agency Federal / Approval Minimal State Agency (Downstream Impact to Hydraulic Approval is Stakeholders) Cost Water Alternative Feasibility Feasible is Feasible Feasibility Supply 1A 1B Legend 1C Carollo predicts FCWD's ability to hurdle the task is 2A feasible for specific alternative. 2B Carollo predicts FCWD's ability to hurdle the task is 2C feasible, however, cost feasibility and funding * 3A * options will be determined by the FCWD available * 3B funds and policy decisions. * 3C Carollo predicts FCWD would not be able to hurdle 6A --- CarolloBlueTemplateWithLogo.pptx the requirements for a specific alternative. 6B --- Feasibility of accomplishment is deemed low. 6C --- 6D --- 6E --- 22
Local Agency Approval (All Alternatives) Task Hurdle Local Agency Federal / State Approval Minimal Hydraulic Agency Cost (Downstream Impact to Feasibility Approval is Feasibility Stakeholders) is Water Supply Feasible Feasible Local Agency Approval (Downstream Stakeholders) is Feasible Agency Owner Request Approximate Cost Titus County Fresh H&H Analysis for ~250K Water Supply District Lake Bob Sandlin Downstream Impacts TCFWSD North East Texas Municipal Water Water Quality CarolloBlueTemplateWithLogo.pptx ~85K Lake of the Pines District Assessment NETMWD 23
Alternatives Matrix Task Hurdle Local Agency Federal / Approval Minimal State Agency (Downstream Impact to Hydraulic Approval is Stakeholders) Cost Water Alternative Feasibility Feasible is Feasible Feasibility Supply 1A 1B 1C 2A 2B 2C * 3A * 3B * 3C 6A --- CarolloBlueTemplateWithLogo.pptx 6B --- 6C --- 6D --- 6E --- 24
Alternatives Matrix Task Hurdle Local Agency Federal / Approval Minimal State Agency (Downstream Impact to Hydraulic Approval is Stakeholders) Cost Water Alternative Feasibility Feasible is Feasible Feasibility Supply 1A 1B 1C 2A 2B 2C * 3A * 3B * 3C 6A --- CarolloBlueTemplateWithLogo.pptx 6B --- 6C --- 6D --- 6E --- 25
Additional Canal CROSSING SECTION CANAL SECTION CarolloBlueTemplateWithLogo.pptx 1,000 FT 26
Hydraulic Feasibility Task Hurdle Local Agency Federal / State Approval Minimal Hydraulic Agency Cost (Downstream Impact to Feasibility Approval is Feasibility Stakeholders) is Water Supply Feasible Feasible 1 - STRUCTURAL ALTERNATIVES Alternative 1A Alternative 1B Alternative 1C 100-YR 350-YR 500-YR Revised 71 culverts* 203 culverts* 243 culverts* Rain Event Probability Conditions 2-year 0.50000 379.1 378.9 378.8 378.7 5-year 0.20000 379.5 379.2 379.0 379.0 10-year 0.10000 379.9 379.6 379.3 379.2 25-year 0.04000 380.5 379.9 379.6 379.5 50-year 0.02000 381.3 380.5 379.9 379.8 CarolloBlueTemplateWithLogo.pptx 100-year 0.01000 382.3 381.0 380.3 380.1 350-Year 0.00285 384.7 382.1 381.0 380.9 500-Year 0.00200 384.9 382.4 381.3 381.0 * 1 Culvert = 10’ Wide X 4’ Tall Box Pipe 27
Federal Agency Approval Task Hurdle Local Agency Federal / State Approval Minimal Hydraulic Agency Cost (Downstream Impact to Feasibility Approval is Feasibility Stakeholders) is Water Supply Feasible Feasible LCS Capacity of Cross Sections Compared with Maximum Discharge of Alternatives 1A / 1B / 1C Alternative 1C Cross Section Alternative Alternative 1B Alternative 1A CS4 CS3 CarolloBlueTemplateWithLogo.pptx CS2 LBS CS1 0 100,000 200,000 300,000 400,000 500,000 Maximum Area (SF) Available CFS Capacity (Cross Section) or Discharge for Discharge (Alternatives) 28
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